/*
 *  Copyright 2009 Advanced Industrial Science and Technology (AIST).
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

/*! \file
 *  \brief
 */
#pragma once

#include <thrust/graph/detail/edge_iterator.hpp>

#include <thrust/detail/device/dereference.h>
#include <thrust/iterator/iterator_traits.h>

namespace thrust {

template <typename Iter, typename EdgeDescriptor, typename CalledSpace>
struct edge_iter;

namespace detail {

  struct edge_iter_friend {
    
    template <typename Iter, typename EdgeDescriptor, typename CalledSpace>
    static inline __device__
    typename device::dereference_result<edge_iter<Iter
                                                  , EdgeDescriptor
                                                  , CalledSpace> >::type
    dereference( const edge_iter<Iter,EdgeDescriptor,CalledSpace>& iter)
    { 
      //return iter.dereference( thrust::called_from_device_tag());
      //return iter._dereference( CalledSpace());
      //return EdgeDescriptor();
      return iter.dereference();
    }
  };
  
  namespace device {
    
    template<typename Iter, typename EdgeDescriptor, typename CalledSpace>
    struct dereference_result< edge_iter<Iter,EdgeDescriptor,CalledSpace> >
    {
      typedef typename thrust::iterator_traits< edge_iter<Iter
                                                          , EdgeDescriptor
                                                          , CalledSpace> >::reference type;
    };
    
    template <typename Iter,typename EdgeDescriptor, typename CalledSpace>
    inline __device__
    typename dereference_result<edge_iter<Iter,EdgeDescriptor,CalledSpace> >::type
    dereference( const edge_iter<Iter,EdgeDescriptor,CalledSpace>& iter)
    {
      return edge_iter_friend::dereference( iter);
    }
    
  } // end namespace device

} // end namespace detail

} // end namespace thrust
